Software Engineer II

Our Purpose

Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we’re helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.

Title and Summary

Software Engineer II

Overview:

We work to connect and power an inclusive, digital economy that benefits everyone, everywhere, by making transactions safe, simple, smart, and accessible. Using secure data and networks, partnerships, and passion, our innovations and solutions help individuals, financial institutions, governments, and businesses realize their greatest potential. Our decency quotient, or DQ, drives our culture and everything we do inside and outside of our company. We cultivate a culture of inclusion for all employees that respect their individual strengths, views, and experiences. We believe that our differences enable us to be a better team - one that makes better decisions, drives innovation, and delivers better business results.

About the Role

Join Mastercard’s Transaction Stream team in O’Fallon, Missouri, and help build the applications and services that power critical capabilities across the real-time payment network. This is an opportunity to work on software that operates at global scale, where speed, reliability, and resilience matter every day. As a Software Engineer II, you will collaborate with engineers and product partners to design, build, test, and enhance solutions that support the movement of transactions around the world.

Role

• Design, develop, test, and support software components and services using modern engineering practices.
• Build backend services, APIs, and application features that are secure, maintainable, and scalable.
• Collaborate within an Agile team to deliver features, participate in code reviews, and support software throughout the development lifecycle.
• Troubleshoot issues, identify opportunities for improvement, and help enhance application reliability, performance, and developer efficiency.
• Take ownership of assigned work, communicate progress clearly, and continue building technical depth through hands-on delivery and collaboration.

All About You

• Experience building applications and REST APIs using Java, Spring Boot, and Spring Data JPA.
• Strong foundation in computer science fundamentals, including data structures, algorithms, and object-oriented design.
• Ability to write clean, secure, testable code and contribute to unit, service, and integration testing.
• Familiarity with front-end development concepts and technologies such as JavaScript or Angular is a plus.
• Comfort working with SQL and relational data concepts.
• Strong analytical and problem-solving skills, with the ability to debug issues and identify practical solutions.
• Strong verbal and written communication skills and an ability to work effectively in a collaborative team environment.
• Self-motivated, organized, and eager to learn, with a passion for continuous improvement and delivering results.
• Bachelor’s degree in Computer Science, Software Engineering, or a related field is preferred.

Mastercard is a merit-based, inclusive, equal opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law. We hire the most qualified candidate for the role. In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact reasonable_accommodation@mastercard.com and identify the type of accommodation or assistance you are requesting. Do not include any medical or health information in this email. The Reasonable Accommodations team will respond to your email promptly.

Corporate Security Responsibility

All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:

• Abide by Mastercard’s security policies and practices;

• Ensure the confidentiality and integrity of the information being accessed;

• Report any suspected information security violation or breach, and

• Complete all periodic mandatory securi